Composition for use in cores.



IlNiTno STATES Patented June 20, 1905.

ATENT COMPOSITION FOR USE IN CORES.

SPECIFICATION forming part of Letters Patent No. 292,828, dated June 20, 1905.

' Application filed October 24, 1903. Serial No. 178,856.

To (all 11/71/077 it may concern:

Be it known that I, JERRY M. HUDSON, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, haveinvented anew and useful Improvement in Compositions for Use in Cores, of which the following is a specification.

This invention relates to a composition of matter which is intended to be used as a binding material for the sand in cores that are used in the production of metal castings.

Heretofore in the manufacture of cores it has been the common practice to mix with the sand, which forms the chief ingredient of the core, a proportion of wheat-flour, this flour serving when the core is baked to securely bind the sand together. The cores thus produced are easily broken or crushed, and, furthermore, they do not readily permit the gases which are formed when themold is poured to pass through them, as a consequence of which the casting often contains blow-holes about the cores. The composition which I -use as a substitute for the flour binds the sand found by experiment that very superior cores are formed from the dust that is produced by crushing and grinding marble, more particularly gray marble, said dust being mixed with the flour of winter-wheat, although I do not desire to limit my invention to these precise ingredients. I have also discovered that the best cores are produced when these ingredients are mixed in the proportions of forty to sixty parts, by Weight, of grain-flour to a proportionately small quantity of marble-dust that is to say, With forty parts of grain-flour I mix sixty parts of marble-dust or with sixty parts of grain -flour I mix forty parts of marble-dust-and satisfactory cores may be formed by using any intermediate proportion. The exact proportion depends upon the character of the core which I desire to produce. Thus, if it is not necessary that the casting be absolutely perfect about the core I employ a greater quantity of marble-dust; but if the casting is to be exceptionally smooth a greater quantity of grain-flour is used.

Without undertaking to explain the reason why, I find by experiment that winter-Wheat flour is preferable to that made from springwheat.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. A composition of matter consisting of marble-dust and grain-flour.

2. A composition of matter consisting marble-dust and wheat-flour.

3. A composition of matter consisting gray marble-dust and winter-wheat flour.

4. A composition of matter consisting of from forty to sixty parts of marble-dust and sixty to forty parts of Wheat-flour.

5. A composition of matter consisting of gray marble-dust and grain-flour.

In testimony whereof I aflix my signature in the presence of two witnesses.

JERRY HUDSON.

IVitnesses:

S. E. Fours, C. McELRoY. 

